Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantas regiões tiveram infiltração de chuva (km³/ano) de 9.3?
 ###Tabelas: CREATE TABLE "giovani_new_generation"_section ("giovani_new_generation"_section_id AUTO_INCREMENT PRIMARY KEY, Position VARCHAR, Singer VARCHAR, 2nd Evening VARCHAR, 3rd Evening VARCHAR, 4th Evening VARCHAR, 5th Evening VARCHAR) CREATE TABLE first_team (first_team_id AUTO_INCREMENT PRIMARY KEY, Exit Date VARCHAR, Pos. VARCHAR, Player VARCHAR, To club VARCHAR, Transfer fee VARCHAR) CREATE TABLE 2000_nfl_draft (2000_nfl_draft_id AUTO_INCREMENT PRIMARY KEY, Round INT, Overall INT, Player VARCHAR, Position VARCHAR, College VARCHAR) CREATE TABLE water_quality (water_quality_id AUTO_INCREMENT PRIMARY KEY, Region VARCHAR, Land area (km 2 ) VARCHAR, Rainfall by depth (mm/year) INT, Rainfall by volume (km 3 /year) VARCHAR, Surface run off (km 3 /year) VARCHAR, Infiltration (km 3 /year) VARCHAR, Evapotranspiration (km 3 /year) VARCHAR) CREATE TABLE winners_by_country (winners_by_country_id AUTO_INCREMENT PRIMARY KEY, Country VARCHAR, Total INT, Marathon (mens) INT, Marathon (womens) INT, Half Marathon (mens) INT, Half Marathon (womens) INT)  
SELECT COUNT Rainfall by depth (mm/year) FROM water_quality WHERE Infiltration (km 3 /year) = 9.3